(In reply to comment #1)
> Can't reproduce on GM45. Could you retest with Mesa master?
Yes. It now works well with the newest code of Nov.1. So verified.
Libdrm: (master)b0b96636dbf93445dd532b09b21fa4fc5ce6bdc7
Mesa: (master)1cc16e1b831cef8e1573cc998cee3e55179bb830
Xserver: (master)d30637339963950910e5f5fb755b8465ac7dddb4
Xf86_video_intel: (master)10946118dd3a63f1375a1bfde0b2f0542a93c1c2